hw4_soln - Rice University ELEC 220 Fundamentals of...

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Rice University ELEC 220 – Fundamentals of Computer Engineering Homework #4 Homework graded out of 100 points. This fourth homework contains problems from Chapters 4 and 5 of the textbook by Patt & Patel, second edition. 1. (20 points, (a) 4, (b) 8, (c) 4, (d) 4)). Chapter 4, problem 4.5. Interpreting values in memory. (a) Location 3 contains 0000 0000 0000 0000 Location 6 contains 1111 1110 1101 0011 (b) i. Two’s Complement - Location 0: 0001 1110 0100 0011 = 7747 Location 1: 1111 0000 0010 0101 = -4059 ii. ASCII - Location 4: 0000 0000 0110 0101 = 101 = ‘e’ iii. Floating Point - Locations 6 and 7: 0000 0110 1101 1001 1111 1110 1101 0011 Number represented is 1.10110011111111011010011 x 114 2 - iv. Unsigned - Location 0: 0001 1110 0100 0011 = 7747 Location 1: 1111 0000 0010 0101 = 61477 (c) Instruction - Location 0: 0001 1110 0100 0011 = Add R7 R1 R3 (d) Memory Address - Location 5: 0000 0000 0000 0110 Refers to location 6. Value stored in location 6 is 1111 1110 1101 0011 2. (15 points.) Chapter 4, problem 4.10. Instruction phases and component use. Refer to the following table: Fetch Instruction Decode Evaluate Address Fetch Data Execute Store Result PC 0001, 0110, 1100 1100 IR 0001, 0110, 1100 MAR 0001, 0110, 1100 0110 MDR 0001, 0110, 1100 0110
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3. (15 points.) Chapter 4, problem 4.16. Machine cycles and timing and pipelines.
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